BONDING BEHAVIOR OF Eucalyptus benthamii WOOD TO MANUFACTURE EDGE GLUED PANELS

Abstract

The main objective of this study was to evaluate the performance of Eucalyptus benthamii Maiden et Cambage wood for the production of edge glued panels. Wood pieces with planed and sanded surfaces were bonded using cross-linking polyvinyl acetate (PVAc) and polyurethane (PUR) based adhesives, at pressures of 0.7 MPa and 1.0 MPa. The same adhesives were used for finger jointing at a pressure of 1.5 MPa. The bonding strength was determined through glue-line shear strength and bending test for finger jointing. According to the results, the pressure and surface preparation variables did not influence the glue-line shear strength of the adhesive PVAc, whereas for the PUR adhesive strength was influenced by the pressures and machining used. All treatments met the minimum values required by the standard; however, the highest bonding strength was found in the sample glued with PUR adhesive at a pressure of 1.0 MPa and sanded surface. The highest modulus of rupture was obtained in the samples glued using PVAc, while the modulus of elasticity was not affected by the type of adhesive used. These results enabled concluding that with regard to its technological properties assessed in the present study, E. benthamii wood is suitable for the production of edge glued panel.

Pine Wood Treated with a Citric Acid and Glycerol Mixture: Biomaterial Performance Improved by a Bio-byproduct

“…This contributes to a weaker bond for coatings on treated specimens. These observations were also reported by other authors (Hernandez and Cool 2008;Podgorski et al 2010;Vistosyté et al 2012;Ozdemir et al 2015). The treatment modifies wood surface properties and surface structure, as observed by Arnold (2010).…”

“…The pull-off testing machine (Material Testing System (MTS), QTest/5kN model from MTS Systems Corporation, Eden Prairie, MN) allowed for constant and repeatable tests. This machine was used for the same purpose by Hernandez and Cool (2008) and Nkeuwa et al (2014). The dollies were placed in the machine and a load (F) was applied perpendicularly to the dolly at a specimen displacement rate of 2 mm/min.…”

Compression and flexural properties of finger jointed mango wood sections

“…However, with finger joints, this has been observed usually with MOE rather than with MOR when tested under flexure. In the case of Eucalyptus benthamii also, similar MOE for two different (PVA and polyurethane-based) adhesives has been reported for finger jointed sections (Martins et al 2013). Table 2 reveals that both the crushing and elastic behaviour under compression parallel to grain of the jointed sections are higher than that of the clear wood sections.…”

EDGE Glued Panels Grading through Transversal Vibration Testing

“…In relation to its raw material, the EGP generally uses wood from planted forests, e.g., pine [6,7], eucalypt [8,9], etc. The adhesives applied in gluing stages are generally based on urea-formaldehyde or phenol-formaldehyde [2].…”